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Watch out for scripts or programs that want to email results to root or whomever. You don't need to remove the sendmail package to stop it from listening for requests.
Besides, the disk space savings are minimal, unless you only have a gig or two drive
I stripped off sendmail, after the fact, on a box that didn't have to provide any public services... well, okay it was the samba server, and I didn't have any problems. This was on Slack 7.1 though, and of course, mileage may differ.
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